A three-time NBA Slam Dunk champion, basketball fans already know all about McClung’s remarkable athleticism. NBA fans were left stunned by the former Chicago Bulls player, who recently signed for Basquet Girona in Spain. “Mac McClung is arguably the greatest dunker (not counting in-game) we have ever seen, and people won’t accept it because it’s Mac McClung,” one wrote. MORE MAC MCCLUNG STORIESAnother asked: “We can all agree Mac is a top 3 dunker of all time, right?” “NBA slam dunk step aside, you just got mega dunked on.